Device and method for network monitoring

Abstract

A network monitoring device that monitors a network state, includes a receiving unit that receives a packet passing through the network; a processing unit that performs analysis of the network state with respect to the packet received; and a determining unit that determines whether a failure has occurred in the network, based on the result obtained by the processing unit.

1. A network monitoring device that monitors a network state, comprising:
 a receiving unit that receives a packet passing through the network; 
 an extracting unit that extracts a search key data from the packet, based on a first rule stored in advance in a storage unit; 
 a searching/selecting unit that searches a second rule stored in advance in the storage unit, using the search key extracted, and selects an analyzing process for the network state, based on a result of the search; 
 a processing unit that performs the analyzing process with respect to the packet received; 
 a determining unit that determines whether a failure has occurred in the network, based on a result obtained by the processing unit; and 
 a notifying unit that notifies an integrated management device of failure, when the determining unit determines that a failure has occurred in the network. 
 
   
   
     2. The network monitoring device according to  claim 1 , wherein
 when the second rule includes an entry corresponding to the search key, the searching/selecting unit records the current time in the entry. 
 
   
   
     3. The network monitoring device according to  claim 1 , wherein
 the processing unit stores, in the storage unit, a number of packets of the same type as the packet received. 
 
   
   
     4. The network monitoring device according to  claim 1 , wherein
 the processing unit records a reception frequency of a packet related to path control, and 
 the determining unit determines whether a failure has occurred in the network, based on the reception frequency. 
 
   
   
     5. The network monitoring device according to  claim 1 , wherein
 the processing unit stores the packet received, in a storage unit. 
 
   
   
     6. The network monitoring device according to  claim 1 , wherein
 the processing unit records a transmission rate of the packet, and 
 the determining unit determines whether a failure has occurred in the network, based on fluctuations in the transmission rate. 
 
   
   
     7. The network monitoring device according to  claim 1 , wherein
 when the searching/selecting unit cannot search an entry corresponding to the search key from the second rule, the notifying unit notifies the integrated management device that no entry is found. 
 
   
   
     8. A network monitoring method that monitors a network state, comprising:
 receiving a packet passing through the network; 
 extracting a search key data from the packet, based on a first rule stored in advance in a storage unit; 
 selecting a second rule stored in advance in the storage unit, using the search key extracted; 
 selecting an analyzing process for the network state, based on a result obtained at the searching; 
 performing the analyzing process with respect to the packet received; 
 determining whether a failure has occurred in the network, based on a result obtained at the analyzing; and 
 notifying an integrated management device of failure, when it is determined at the determining that a failure has occurred in the network.